A tracker updated November 1, 2026, compares the latest models listed in official documentation from Google, OpenAI and Anthropic, while separating documented release dates from dates reported elsewhere.

Google lists Gemini 4 Argon (gemini-4-argon) as generally available through its API from October 13 for complex coding, agentic, math and science tasks; the listing does not establish availability in consumer apps.

Google’s changelog also records Gemini 3.8 Flash as generally available on September 2, following Gemini 3.7 Flash on August 13 and Gemini 3.6 Flash on July 21.

Anthropic released Fable 5 and Mythos 5 on June 9, suspended access three days later to comply with US export controls, and restored access on July 1 after the Department of Commerce lifted the controls on June 30.

OpenAI’s models page lists GPT-6 Astra (gpt-6-astra), GPT-6.1 Sol (gpt-6.1-sol), GPT-6.1 Terra (gpt-6.1-terra) and GPT-6 Luna (gpt-6-luna), describing Astra as its most capable model and Sol as a lower-cost option; the page provides no release dates, and outside reports conflict.

Anthropic’s current-model list includes Claude Fable 5.1, Opus 5.5, Sonnet 5.5 and Haiku 5.5, all with a 1-million-token context window; Haiku 5.5 is positioned for high-volume, latency-sensitive tasks, though its reported October 7 release date is unconfirmed.